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H. J. RICHARDSON. Instrument for Computing Time.

No. 235,703. Patent'ed Dec. 21,1880.

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JANUARY MFETERS. PHOTO LITHOGRAFNER WASMINGTQN n C UNITED STATES P TENTOFFICE.

HENRY J. RICHARDSON, OF BROOKLYN, NEW YORK.

INSTRUMENT FOR COMPUTING TIME.

SPECIFICATION forming part of Letters Patent No. 235,703, dated December21, 1880.

Application filed July 10, 1880. (N0 model.)

To all whom it may concern Be it known that I, HENRY J. RICHARDSON, ofthe city of Brooklyn, county of Kings, and State of New York, haveinvented a Machine for Measuring Days, of which the following is aspecification.

This invention is fully shown in the accompanying drawings, making partof this specification, in which- Figure 1 is an end View (both endsbeing alike) of the invention, the end piece being removed in order toshow the roller J. L L is the spindle upon which the roller J revolves.A A is an endless ribbon or belt, made of cloth-lined paper or othersuitable material. This endless belt A A passes through the grooves H H,round the roller J, and through the slot M. D, E, F, and G are madeofwood or other material, and are firmly fastened together. In thedrawings, Fig. 1, the endless belt A A is cut above and below the rollerJ, in order that the roller J may be shown. The endless belt Ahas markedor printed upon it, in regular order, the names of every month containedin two years, and the space occupied by each month is equally divided bymeans of lines, in such a manner that all the days in the two yearsaforesaid are marked on the endless band A at equal distances apart, andenough of the lines are numbered in such a manner that the linesindicating the months and days of the month can be readily singled out.I is a stud, made of wood or other suitable material, securely fastenedto the endless band A, in order that the endless band A may be easilyshifted. Upon the top of the piece D is a scale, B, Fig. 5, and upon thetop of the piece E is a scale, C, Fig. 5. These scales B and O aredivided into three hundred and sixty-five (365) spaces, the linesdividing these spaces being at exactly the same distance apart "as arethe lines on the endless band A. On

the scales B and O enough of the lines are numbered in such a mannerthat the number appropriate to any line can be easily determined. On thescale B the numbers run from right to left, and on the scale C thenumbers Fig. 3 is a longitudinal vertical section, in which K K are endpieces, made of wood or other suitable material. The two end pieces, KK, and the bottom piece, G, could be dispensed with, as they are onlyintended to protect the endless belt A from injury.

Fig. 4 is a longitudinal horizontal section, the endless band A beingremoved in order to show the rollers J J.

Fig. 5 shows portions of the endless belt A and the scales B and G intheir relative positions.

Fig. 6 is a perspective view of one end of the invention.

In the drawings like parts of the invention are pointed by the sameletters of reference.

The object of my invention is to aid bookkeepers and others inascertaining the number of days from any given day to all other dayswithin a period of one year, either prior or subsequent to the saidgiven day.

The manner of using my invention is as follows: To find the number ofdays from any given day to all other days prior to the given day, movethe endless band A by means of the stud I'until the line representingthe given day is opposite the cipher N on scale B, Fig. 5, and exactlyopposite the lines on the endless band A will be shown, on the scale B,the lines indicating the number required. To find the number of daysfrom any given day to all other days subsequent to the given day,proceed exactly as prescribed in preceding sentence, using scale C andthe cipher 0, Fig. 5, instead of scale B and the cipher N, Fig. 5. Inleap-year proper allowance must be made for the extra day in February.

By this method of finding the number of days there will be a greatsaving of time to book-keepers, accountants, discount-clerks in banks,and all others having to calculate interest or to average accounts.

The invention can also be used for quickly determining the dates whennotes drawn by days fall due.

In an endless belt passing round rollers, as described in thisspecification, I use what I consider the best method of obtaining thedesired result 5 but instead there could be used a similar belt, notendless, fastened to a roller at each end and Wound up on the saidrollers; but the principle is the same, and such a belt is regarded byme as the equivalent of an en (1- less belt.

I am Well aware that endless ribbons have been used heretofore incalculating-machines, and also that by means of sliding scales time hasbeen computed within the limits of a calendar year. I therefore claimneither of these 10 devices as my invention; but

What I claim is- An instrument for computing time consisting of anendless ribbon having the months and days for two entire calendar yearssuitably marked upon it, in combination with two graduated scales, onecontaining the days in a year numbered from right to left and the othercontaining the days in a year numbered 4 from left to right,substantially as described, and for the purpose set forth.

H. J. RICHARDSON. In presence of FRANK LoUTREL, GEORGE W. HORTON.

